GB790857A - Improvements relating to the hydrocatalytic desulphurisation of petroleum hydrocarbons - Google Patents

Abstract

Petroleum hydrocarbons are hydrocatalytically desulphurized by contacting in liquid phase with a sulphur-resistant hydrogenation catalyst at elevated temperature and pressure; the feedstock is admitted to the reaction zone at a temperature sufficiently below the desired reaction temperature that the heat of reaction raises the reactor temperature to the desired temperature. The catalyst may comprise the oxides of cobalt and molybdenum supported on alumina. Petroleum hydrocarbons referred to are gas oil, cracked gas oil obtained from catalytically cracking a wax distillate and a mixture of 80 per cent gas oil and 20 per cent cracked gas oil. In examples, various feedstocks are treated (1) at 1000 p.s.i.g., 8 v./v./hr., a gas recycle rate of 1250 SCF/B., and using a feedstock inlet temperature of 750 DEG F. and a maximum catalyst bed temperature of 790 DEG F.; and (2) at 475 p.s.i.g. 1.25 v./v./hr., a gas recycle rate of 1100 SCF/B, and feedstock inlet and outlet temperatures of 681 DEG F. and 700 DEG F. respectively. Platformer exit gas is used as make-up gas in both examples.